I haven't seen how a '38 wire enters the glovebox, but for the '40 models the wire came in from the bottom of the lower left front of the glovebox through a brass grommet. I thought they might have done the same for the '38 models. I know the clock is different from the '40, but they both are in the center of the glovebox door. As I recall, a portion of the wire is exposed inside the glovebox from the clock until it exits through the grommet.